How long does the scent last?

Paper air fresheners typically deliver strong scent for 3–4 weeks, then gradually fade. Longevity depends on cabin ventilation and how often you drive with windows open.

Can I control which scent I smell more — the Koi or the Lychee Squash?

Position the freshener to favor one side of your cabin if you prefer one aroma over the other. Scent intensity will vary slightly based on hanging location and airflow.

Will this work on any rearview mirror setup?

The loop attachment fits standard rearview mirror stems. If your mirror has an unusual mount or cover, test the loop fit before relying on it as your primary hold.